Grain boundary relaxation
WebApr 5, 2024 · [44, 48] Based on this model, the relaxation could occur by the flow of matter along the grain boundaries which may cause the local thickening/thinning of the grains in the constrained film [44, 46] (Figure 8e), undeformed lattice planes and deformed grain boundaries). Therefore, the Coble creep model is used for the quantification of the creep ... WebNov 30, 2024 · Grain boundary (GB) diffusion and viscous flow play dominant roles in mechanical relaxation of polycrystalline materials. The pioneering work of Zener and Kê, …
Grain boundary relaxation
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WebSep 16, 2024 · In addition, the grain structure and the nature of grain boundaries in metals is very different from that in rocks or concrete. Therefore, linking relaxation elastic effects to the microstructure is needed to understand the physical origin of slow dynamics in metals. Here, interpreting the relaxation phenomenon as a multirelaxation process, we ... WebDec 6, 2024 · The grain boundary sliding mechanism was incorporated into the plastic deformation during the stress relaxation test, and the strain rate sensitivity and activation volume obtained by stress relaxation after modification agree well with that obtained by the strain rate jump test. Keywords:
WebJun 10, 2024 · The role of GBS during relaxation is studied using the deformation induced evolution of surface inhomogeneity. Determinations of surface profiling step heights at grain boundaries and inclination of grains were used to quantify the effect of GBS. The estimated activation volume of 4.35 b^3 further confirms the role of slip induced GBS on the ... WebSep 1, 1996 · The U.S. Department of Energy's Office of Scientific and Technical Information
Webbook [21]. Such mechanisms—interfacial sliding, grain boundary diffusional creep and rotational deformation— effectively operate in nanocrystalline solids, first of all, due to … WebApr 11, 2024 · Watanabe, “An approach to grain boundary design for strong and ductile polycrystals,” Res. Mech. 11(1), 47–84 (1984). GB engineering is proposed to deliberately manipulate the GB structure in order to improve material properties such as corrosion resistance, intergranular cracking, or ductility. 26 26. T.
WebSep 16, 2024 · The increase in grain boundary resistance probably resulted from the higher grain boundary density under pressure, which consequently generated additional dangling bonds. This statement was …
WebMay 22, 2016 · The boundary with a high excess volume sheared elastically, while bulk-nucleated dislocations produced plastic relaxation. ... To observe plasticity of grain boundaries independently of the bulk plasticity, we simulate nanoindentation of bicrystals. On the low angle twist boundaries, the intrinsic grain boundary (GB) dislocation … flare hard copperWebOct 23, 2024 · The role of grain boundary scattering in reducing the thermal conductivity of polycrystalline XNiSn (X = Hf, Zr, Ti) half-Heusler alloys Scientific Reports Open Access 23 October 2024 The... can spot shot be used on upholsteryWebApr 24, 2024 · Grain boundary relaxation can be induced by deforming very fine nanograins below a critical size, typically several tens of nanometers. Here, we found … flare hard headWebbook [21]. Such mechanisms—interfacial sliding, grain boundary diffusional creep and rotational deformation— effectively operate in nanocrystalline solids, first of all, due to the presence of a very large number of grain boundaries [19–21]. In the context discussed, it is natural to think that these specific deformation mechanisms can can spots be hardWebMar 13, 2024 · It can give information on the charge transfer mechanisms such as the frequency-dependent impedance, relaxation time, grain, grain boundary, and electrode contribution in a material. For our material, EIS measurements were accomplished in a frequency range from 0.1 Hz to 1 MHz using a frequency response analyzer. The total … can spots be caused by stressflare hawk trailerWebfavor GB sliding and grain rotation, which are collective processes that could be expected to be more effective at relaxing non-equilibrium GB structures. Atomistic details of the … can spots bleed